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[2] See S. Wolfram, ``Computer software in science and mathematics'', Sci. Amer. 251 (September 1984) 188. For information on cellular automata, see S. Wolfram, ``Cellular automata as models of complexity'', Nature 311 (1984) 419. For more technical discussion of computation theory applied to physics, see S. Wolfram, ``Undecidability and intractability in theoretical physics'', Phys. Rev. Lett. 54(1985) 735; S. Wolfram, ``Origins of randomness in physical systems'', Phys. Rev. Lett., to be published.